| 摘要 |
The invention relates to a method for maintaining field devices (F1-F4) used in process automation technology by means of a maintenance computer (WS3, WS4) of a device manufacturer, which is located in the company network LAN2 of the field device manufacturer and connected to at least one field device via the company network (LAN2), a public network (Internet) and a customer network LAN1). According to the inventive method, the public network is provided with a directory server in which a customer unit and the maintenance computer (WS3, WS4) are logged on and which, upon the customer request, assigns a session identification number, selects the network address of a relay server (R) connected to the public network (I) and transmits said address to the customer unit and to the maintenance computer (WS3, WS4). Said relay server (R) and the session identification number enable to set a peer-to-peer connection for exchanging field device information between the customer unit and the maintenance computer (WS3, WS4) in such a way that said peer-to-peer connection makes it possible to communicate via the firewall computers (FW1, FW2) which protect the manufacturer-side network and the customer-side network (LAN1, LAN2) from the public network (I). |
